Subg. Onthophagus (Paraphanaeomorphus) Balthasar, 1959

Onthophagus (Paraphanaeomorphus) Balthasar, 1959, Sbornik Ent. Odd. Nár. Mus. Praze, 33: 465 (Type species: Onthophagus phanaeicollis Lansberge, 1883).

Key to species of Onthophagus (Paraphanaeomorphus) from Hong Kong.

1 Head with one straight horn; head and pronotum in strong metallic green, pronotum with one horn and two depressions; yellow area much bigger than black area on elytra............................................ Onthophagus (Paraphanaeomorphus) argyropygus Gillet, 1927 Head with one flat horn extended backward; head and pronotum without strong metallic green colour; pronotum with two knobs but without depression; yellow area and black area in similar size on elytra ............................................................................................... ................................................................................................. Onthophagus (Paraphanaeomorphus) trituber (Wiedemann, 1823)